/Engine/Source/Runtime/Engine/Public/Physics/Experimental/PhysScene_Chaos.h
int32 DirtyElementCount ( [Chaos::ISpatialAccelerationCollection](API\Runtime\Engine\PhysicsEngine\ISpatialAccelerationCollection)< [Chaos::FAccelerationStructureHandle](API\Runtime\Chaos\Chaos\FAccelerationStructureHandle), [Chaos::FReal](API\Runtime\ChaosCore\Chaos\FReal), 3 > & Collection )